Sodium pyrosulfite automatic batching and adding alkali device and method

Abstract

The invention discloses an automatic sodium metabisulfite blending and alkalifying device and method. The device comprises a sodium carbonate storage chamber and a sodium carbonate preparing tank, wherein a sodium carbonate feed conveying belt is arranged at a feed inlet of the sodium carbonate storage chamber; a weighing device with four weighing sensors is mounted on the sodium carbonate storage chamber; and a variable-frequency speed-control double-tube spiral feeding scale conveying device is arranged below the sodium carbonate storage chamber. According to the device, the feeding is carried out by utilizing the self-gravity of sodium carbonate; the weighing device and the variable-frequency speed-control double-tube spiral feeding scale are additionally arranged, and a PLC control system is adopted, so that the degree of production automation is improved. Thus, the quality of a sodium metabisulfite product is improved, the labor workload of a worker is lightened and the loss of materials is reduced.

Description

technical field [0001] The invention relates to the field of sodium pyrosulfite batching system, and mainly relates to a sodium pyrosulfite automatic batching and adding alkali device and method. Background technique [0002] At present, in the production of sodium pyrosulfite, soda ash (chemical name: sodium carbonate) is transported to the soda ash silo through the soda ash feeding belt, and then falls from the soda ash silo by gravity, and enters the frequency conversion speed regulation double-tube screw feeding scale. The set amount automatically enters the soda ash preparation tank, and the double-pipe screw feeding scale with variable frequency speed regulation and the feed water flow rate of the soda ash preparation tank form a single closed-loop ratio adjustment system, which is automatically prepared into a soda ash aqueous solution of required concentration, and then sent to the third-stage reaction kettle and SO2 undergoes a chemical reaction to produce sodium me...

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Problems solved by technology

Such a device completely relies on the operating experience of the operator to control the feeding amount of soda ash, which not only increases the physical exertion of the operator, but also often occurs the situation of "adding water when there is too much alkali, and adding alkali when there is too much water". The concentration of the soda ash aqueous solution is difficult to control. Resulting in a decline in the quality of sodium metabisulfite products

When there is too much water, the concentration of sodium pyrosulfite in the first-stage reactor is low, which not only increases the workload of the centrifuge, prolongs the production cycle, but also increases energy consumption; To form soda ash precipitation, it is necessary to arrange personnel to regularly enter the bottom of the tank for manual cleaning, and the cleaning workload is very heavy (the sodium pyrosulfite plant has a total of 8 sets of alkali distribution systems)

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